Add a more compact representation of usage stats.

We are replaceing the package name in the activity name with a * iff the activity is in the
same package, otherwise the activity name is pritned out in full.
This small change will remove a lot of bytes (in the order of kilobytes for a real log) from the logged data on the network and downstream processing,
since the package name is repeated in almost all cases.

 An exampe of the new format is here:
 DUMP OF SERVICE usagestats:
 D:4,20090813
 P:com.android.launcher,4,155456
 A:*.Launcher,4,0,0,0,0,0,0,0,0,0,2
 P:com.android.browser,1,6724
 A:*.BrowserActivity,1,0,0,0,0,0,0,0,0,0,0
 A:*.CombinedBookmarkHistoryActivity,1,0,0,0,0,0,0,0,0,0,1
 P:com.google.android.apps.maps,1,2219
 A:com.google.android.maps.MapsActivity,1,0,0,0,0,0,0,0,0,0,0
 P:com.android.contacts,1,0
 A:*.DialtactsActivity,1,0,0,0,0,0,0,0,0,0,1

1 files changed, 8 insertions, 1 deletions

diff --git a/services/java/com/android/server/am/UsageStatsService.java b/services/java/com/android/server/am/UsageStatsService.java
index d458911..66868a3 100755..100644
--- a/services/java/com/android/server/am/UsageStatsService.java
+++ b/services/java/com/android/server/am/UsageStatsService.java
@@ -695,7 +695,14 @@ public final class UsageStatsService extends IUsageStats.Stub {
                 if (NC > 0) {
                     for (Map.Entry<String, TimeStats> ent : pus.mLaunchTimes.entrySet()) {
                         sb.append("A:");
-                        sb.append(ent.getKey());
+                        String activity = ent.getKey();
+                        if (activity.startsWith(pkgName)) {
+                            sb.append('*');
+                            sb.append(activity.substring(
+                                    pkgName.length(), activity.length()));
+                        } else {
+                            sb.append(activity);
+                        }
                         TimeStats times = ent.getValue();
                         sb.append(',');
                         sb.append(times.count);